Silver, I remember getting it for Christmas when I was like 9 years old, good times

Spent so much time playing my Pokémon gold.
But actually I prefered silver due to aeroblast Lugia.

I thought you had to either get the lugia from crystal with aeroblast or you needed to use the Pokemon Stadium's 2 Move relearner? I don't believe the silver lugia had aeroblast.

Haven't played Stadium2 but the one in silver (lvl 40) had aeroblast, while the gold one on lvl 70 has already forgotten it.
But I cannot tell you which move it was replaced by.

The majority of GBC games are... mediocre.

Having saying that, there are a few worthwhile games:

Zelda video games
Wario Land video games
Dragon Warrior video games
Golfer Mario (tennis is ok, but golf is surprisingly deep and fun)
Pokemon video games (Pinball, Card Game, etc)
Bomberman (particularly Quest, which is one of the system's best games!)
Metal Gear Solid: Ground Zeroes
Shantae (get a reproduction, the original is hundreds of dollars)
Daikatana (a zelda-like action rpg that isn't like the horrible console/pc games)
Heroes of Might and Magic II Is the system's best (and only) SRPG. The first game should be avoided.

I would avoid Super Mario Deluxe like the plague... it's a poor remake of a classic with a skewed viewing field... and the same goes for Megaman Extreme.

Where is crystal?